Means of determining the evenness of textile threads



Jan. 2,1934. RASCHULTZ 1,941,917

MEANS OF DETERMINING THE EYENNESS-OF TEXTILE THREADS Filed Nov. 14, 1930 2 Sheets-Sheet l Jan. 2, 1934. P. A.- SCHULTZ 1,941,917

MEANS OF DETERMINING THE EVENNESS 0F TEXTILE THREADS Filed Nov. 14, 1930, 2 Sheets-Sheet 2 'Uiqll- Patented'Jan. 2, 1934 v UNITED STATES.

PATENT OFFICE MEANS OF DETERMINING THE EVENNESS F rnx'rma 'rrmnans I Peter Albert Schultz, Arnhem, Netherlands, issignor to American Glanzstofl Corporation,

New York, N. Y., a corporation of Delaware Application November 14, 1930, Serial No."

495,799, and in Germany December 24, 1929 4 6 Claims. (01. 265-2) It is well known, that the tensile strength and elongation of textile threads may be determined 7 dication of the evenness of the thread, of the elongation of greater lengths, or of the number 10 and distribution of weak spots.

The object of this invention is toprovide an arrangement for the continuous testing of.

threads, particularly of rayon threads, for theirtensile strength and elongation, whereby any length of thread may be tested.

The apparatus involves means wherebygsmall, exactly measured, sections of the thread are subjected continuously'to a certain, specific, tension, and in which the elongation, and its variations, are registered. Of course, the tension has to be chosen so that the thread in general is not burdened to the breaking point. As it is not possible to automatically equalize the varying elongations appearing on the testing sections,

and as the same piece of thread should not be subjected to tension twice, the length of the thread transported between two successive tests is so selected that it is a little longer than --the distance between the two clamps.

The following is a description of an arrangement for testing the evenness of threads. The thread to be tested runs through a light thread brake which causes a uniform preliminary tension, and from there passes through two clamps which determine exactly the length of the thread section which is to be tested. The thread runs from the second clamp to a take-up roller.

Between the stretching clamps the thread is put over two small rollers running, on points be-.

tween which the thread is placed under tension by means of a light, vertically posed rod to which may also be attached'a small roller, and on which suitable weights corresponding to the denier of the thread may be placed. Attached to the tensioning rod or its guide tube, or rail, is a light writingarrangement which records the elongation of the thread on a continuously moving paper strip. For a testing length of 20 cm, for instance, a dropping of the tensioning rod and con- -sequently of the writing pen by 'l mm corresponds to an elongation of about 1%. The takeup roller, which takes the thread through the testing apparatus, is driven by a main drive through an intermediary friction spring coupling. The elasticity of the spring is chosen in sioning rod and the removing to t such a way that the drum does not rotate during'the stretching of the thread between the clamps without, however, causing an overstretching of the remainder of the thread.

The regular opening and closing of the stretching clamps as well as the releasifig of the tene initial position is done automatically by a common shaft by means of eccentric disks. Furthermore, the same shaft has an endless screw driving the take-up roller for the paper strip of the writing apparatus.

In order to specifically show the manner in which my invention may be carried out, I have prepared the accompanying drawings, in which: 7

Figure 1 is a front elevational view of the thread testing device;

Figure 2 is a vertical section along the lines 22 of Figure 1, disclosing the stressing system and automatic release; D

Figure 3 is a detail vertical cross section of one ofthe thread clainps and driving mechanism therefor; and

Figure 4 is a detail view showing themanner in which the take-up roller for the thread is operatively connected to the friction disk.

The thread 1 passes through a thread brake 2 and through two, clamping devices 3 and 4,

from where it passes to the take-up roller 5 Since the particular type of thread brake is not 5 essential to my present invention, any conven-, tional form of thread braking means may be em-' ployed. Located between the two clamps are a pair of small-anti-friction rollers 6 and 7 between which the thread is burdened by means of a stressing rod 8. As will be noted from an inspection of Figure 1 this rod isslidably mounted in a guide bracket 4 9 adjustably secured to a suitable support by an adjusting screw 18' and moves in a plane, perpendicular to the thread. A writing mechanism is secured to the rod 8 by means of which elongations of the thread are recorded on a continuouslymoving paper strip 11. The writing mechanism comprises a fluid holder 10' provided with an inscribing point 10" secured to a bar 10. The bar 10 is provided with an extension which is secured to the rod 8 byv means of a suitable clamp-8'. According to the strength of the textile thread to be tested, different weights 12 can be placed at the upper end of the rod 8. The shaft 20 and gear 15 are kept in continuous motion by a common drive wheel 13 through the gear and worm transmission 13".

The take-up roller 5 is driven by the gear 15 through frictional engagementwith the spring tuated by a plurality of eccentric disks or cams which are secured at spaced intervals to the shaft 20. The eccentric disks or cams 16 open and close the thread clamps 3 and 4 through the levers 16' to which the said clamps are pivotally secured. The levers are each provided at one end with an adjustable bolt which, contacting with the face of the cam, cause the desired opening and closing of the clamps. The cams 16 are so positioned on the shaft 20 that during the rotation of the shaft first clamp 4, then clamp 3 is closed. The desired vertical movement is imparted to the rod 8 by the eccentric disk or cam 17, through the pivotally mounted lever 18 and bolt 19. Upon rotation of the shaft 14 the lever is lifted thereby raising the rod 8 to the desired height. Cam 1'! is so positioned on theshaft 14 that the rod 8 is not released from its' uppermost position until after the closing of the clamps on the thread. After a short time during which the clamped thread is tensioned withweights causing an elongation thereof, the working method is reversed, i. e. the tensioning rod'(8 is returned to its highest position, clamp (4) is first opened and then clamp (3). After the thread has thus been released, it is taken up by roller (5) until clamp (4) is again closed. The circumference of the take-up roller (5) or its speed of rotation is chosen in such a way that during the opening of clamp (3) and the subsequent automatic closing -of clamp (4) a piece of thread of a somewhat greater length than the distance between the clamps is transported. According to the percentage of the elongation of the thread to be tested, the length of the thread, for instance, is placed at 24 or 28 cm etc. with a clamped length of 20 cm.

Having now set forth my invention as required by the patent statutes, I claim:

1. In a testing device for determining the quality of threads, in combination, spaced thread clamps, anti-friction rollers positioned therebetween, means for introducing successive lengths of thread to thesaid clamps and rollers, a tensioning device for imparting a stress to each successive length of thread, and means acting automatically and continuously to record the elongation of the thread caused by the said tensioning device.

2. In a testing device for determining the quality of threads, in combination, spaced thread clamps, anti-friction rollers positioned therebetween, means to successively introduce lengths of threads to the said clamps and rollers, a tensioning device for imparting a stress to each successive length of thread, and means associated therewith acting automatically and continuously to record the elongation of the thread caused by the said tensioning device.

3. In a testing device for determining the quality of threads, in combination, spaced thread clamps, means to successively introduce lengths of threads to the clamps, the said clamps being in the same horizontal plane, a support located between and above the said spaced clamps, a' tensicning device slidably secured to the said support and movable perpendicularly to the. length of the thread held by the said clamps} and means associated therewith to record the elongation of the thread caused by the pressure of the tensioning device against the thread.

4. In a testing device for determining the quality of threads, in combination, spaced thread clanips,spaced anti-friction rollers mounted therebetween, means to successively introduce lengths of threads to the said clamps and anti-friction rollers, the said clamps and rollers being in the same horizontal plane, a support located between and above the spaced anti-friction rollers, a tensioning device slidably secured to the said support and movable perpendicularly to the length of the thread held by the said clamps and means associated therewith to record the elongation of the thread caused by the pressure of the tensioning device against the thread.

5. In a testing device for determining the quality of threads, in combination, spaced thread clamps, means to successively introduce lengths of thread to the clamps, said means also acting to take up the thread, the said clamps being in no the same horizontal plane, a support located between and above the spaced thread clamps, a tensioning device slidably secured to the said support and movable perpendicularly to the length of the thread held by the said clamps, means associated 11s therewith to record the elongation of the thread caused by the'pressure of the tensioning device against the thread.

6. In a testing device for determining the quality of threads, in combination, spaced thread 129 clamps, spaced anti-friction rollers mounted therebetween, the said clamps and rollers being in the same horizontal plane, meansto successively introduce lengths of threads to the said clamps and rollers, said means also acting 25 to take up the thread, a support located between and above the spaced anti-friction rollers, a tensioning device slidably secured to the said support and movable perpendicularly to the length of the thread held by the said clamps,

means associated therewith to record the elongation of the thread caused by the pressure of the tensioning device against the thread.

PETER ALBERT SCHULTZ. 

